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Support custom backends in Random.

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Useful for tests.
This commit is contained in:
Felix Geyer 2013-10-09 22:06:32 +02:00
parent e087baeb48
commit 9c788a6e84
7 changed files with 70 additions and 24 deletions
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41
src/crypto/Random.cpp
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@ -25,9 +25,17 @@
#define QUINT32_MAX 4294967295U
#endif
class RandomBackendGcrypt : public RandomBackend
{
public:
void randomize(void* data, int len) Q_DECL_OVERRIDE;
};
Random* Random::m_instance(Q_NULLPTR);
void Random::randomize(QByteArray& ba)
{
randomize(ba.data(), ba.size());
m_backend->randomize(ba.data(), ba.size());
}
QByteArray Random::randomArray(int len)
@ -51,7 +59,7 @@ quint32 Random::randomUInt(quint32 limit)
// To avoid modulo bias:
// Make sure rand is below the largest number where rand%limit==0
do {
randomize(&rand, 4);
m_backend->randomize(&rand, 4);
} while (rand > ceil);
return (rand % limit);
@ -62,13 +70,32 @@ quint32 Random::randomUIntRange(quint32 min, quint32 max)
return min + randomUInt(max - min);
}
void Random::randomize(void* data, int len)
Random* Random::instance()
{
if (!m_instance) {
m_instance = new Random(new RandomBackendGcrypt());
}
return m_instance;
}
void Random::createWithBackend(RandomBackend* backend)
{
Q_ASSERT(backend);
Q_ASSERT(!m_instance);
m_instance = new Random(backend);
}
Random::Random(RandomBackend* backend)
: m_backend(backend)
{
}
void RandomBackendGcrypt::randomize(void* data, int len)
{
Q_ASSERT(Crypto::initalized());
gcry_randomize(data, len, GCRY_STRONG_RANDOM);
}
Random::Random()
{
}